Light emitting diode driving circuit and light apparatus having the same

A light apparatus comprising:

• a rectification unit configured to half-wave rectify an AC voltage;
• a light emitting unit comprising a plurality of series-coupled LED groups, each comprising at least one LED;
• and
• a LED driving circuit configured to sequentially drive the plurality of the LED groups,
• wherein the LED driving circuit comprises:
• a plurality of mid nodes coupled to each of terminals of the plurality of the LED groups;
• a common node with a reference voltage;
• a switch unit configured to form a plurality of current movement paths between the common node and the plurality of the mid nodes and configured to select a current movement path based on a control signal;
• a current measuring unit configured to detect a current flow through the common node;
• and
• a current control unit configured to generate the control signal based on the detected current flow.

A method of driving a plurality of series-coupled light emitting diode (LED) groups each comprising at least one LED, the method comprising:

• detecting a current flow through a common node of a driving circuit, the driving circuit comprising the common node, a plurality of mid nodes coupled to terminals of the plurality of the LED groups, a common node with a reference voltage, and a switch unit configured to form a plurality of current movement paths between the common node and the plurality of the mid nodes;
• generating a control signal based on the detected current flow;
• and
• selecting a current movement path from the plurality of current movement paths based on the control signal.